# Zombie evolution speed (no noticeable evolution)
**URL:** https://discourse.cataclysmdda.org/t/zombie-evolution-speed-no-noticeable-evolution/22343
**Category:** The Bunker
**Created:** [December 30, 2019, 10:29am UTC](https://discourse.cataclysmdda.org/t/zombie-evolution-speed-no-noticeable-evolution/22343 "2019-12-30T10:29:21Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Tamior](https://discourse.cataclysmdda.org/u/Tamior)
#### Post date: [December 30, 2019, 10:29am UTC](https://discourse.cataclysmdda.org/t/zombie-evolution-speed-no-noticeable-evolution/22343/1 "2019-12-30T10:29:21Z")
I haven’t played much for about half a year or so. Now when creating new worlds (in the latest experimental) I’m using the same setting of 4.0 for zombie evolution scaling factor as I always did — but there is no noticeable evolution (for 40+ days as far as I can see).
It really makes me wonder what’s going on. Do I have to enable it or something?
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### Author:  [@Vormithrax](https://discourse.cataclysmdda.org/u/Vormithrax)
#### Post date: [December 30, 2019, 6:18pm UTC](https://discourse.cataclysmdda.org/t/zombie-evolution-speed-no-noticeable-evolution/22343/2 "2019-12-30T18:18:22Z")
Using default options you won’t see evolved zombies start to appear until day 50-60.